I am upgrading EBS Database from 10gR2 (10.2.0.3) to 11gR2 11.2.0.3. While going through Oracle Note Complete Checklist for Manual Upgrades to 11gR2 [ID 837570.1], under the point 3 of "Recommendations from Source database" it says:

"Disable the custom triggers that would fire before/after DDL and enable them after the upgrade is complete."

I want to know is it compulsory to disable the custom triggers? If yes then how can I get the list of those custom triggers and disable/enable them before and after the database upgrade?